IBM System/360 20 User Manual

.--,
the Basic Monitor contained invalid
addresses, or a problem program
changed the contents of the Basic
Monitor area. In any case, the job
must be discontinued.
• Press the Start key on the CPU con-
sole to initiate the end-of-job
routine.
1441. Have the hardware analyzed by an
L_J IBM customer en gineer • When this
analysis has been made, the job
must be discontinued.
r-,
• Press the Start key on the CPU con-
sole to initiate the end-of-job
routine.
)451 Display locations 10 and Al, which
L-J contain the address of the CCW con-
.--,
taining the error.
If the address displayed is that of a
location within the Basic Monitor
area, part of the Basic Monitor has
been destroyed by a problem program.
In this case, a new system run (start-
ing with the IPL procedure) must be
initiated. If the address displayed
indicates a location within the pro-
blem program, the job must be discon-
tinued. Press the start key on the
CPU console to initiate the end-of-job
routine.
1461 The condition cannot be corrected. If
L--J it is desired to further identify the
r-,
halt, the following steps may be
taken.
• Display location 9C, which contains
the address of the tape drive
concerned.
• Display locations AO and A1, which
contain the address of the CCW.
• Display the first byte of the CCW,
which contains the command code.
If the cornman d code is a 4 (sense),
no sense data has been stored. If
the command code is not 04, loca-
tions DO thro ugh DS (sense data)
may be displayed.
Discontinue the job by pressing the
start key on the CPU console to initi-
ate the end-af-job routine.
1471 If the halt follows an operator-choice
L-J halt and the cause of the latter was
considered a disaster condition, no
further diagnosing is required.
Otherwise, perform the following steps
to identify the cause of the halt.
• Display location 9C, which contains
the address of the tape drive
concerned.
r--,
• Display location DO (sense byte 0).
If bit 3 (equipment chec~, and/or
bi t 5 (overrun), and/or bit 6 (word
count zero) of this byte are on,
the cause of the halt is a hardware
malfunction. In this case, have
the hardware analyzed by an IEM
customer engineer. Otherwise, con-
tinue with the following step.
• Display locations AO and A1, which
contain the address of the CCW.
Display the command code (1st byte
of the CCW). If the command code
is 27 (backspace block), 2F (back-
s;ace file), or OC (read backward),
display location D 1 (sense byte 1)
and check bit 4 (load-point bit).
If this bit is oa
,
the error halt
was caused by a backsFace or read-
backwara operation that led to or
was attempted at load-point. In
this case, display location 9D
(unit status) and inspect bit 5
(device-end bit) to determine
whether the oFeration was attempted
at load-point or led to load-point
(on = to load point, off = at load
point) .
If the command code is not 27, 2F,
or OC, or if the load-point bit is
off, continue with the following
step.
• Dis~lay location DO (sense byte 0)
and check bit 4 (da ta check). If
the bit is on, the halt was caused
by an irrecoverable read error
(during the execution of a read or
read-backward command) that could
not be handled by the problem pro-
gram. If the bit is off, the tape
drive or the tape control unit left
ready status during the execution
of a command because (1) the power
dropped, or (2) the reset key of
the dri ve was pressed, or (3) an
operation was not terminated bafore
the physical end of the tape was
reached (read or forward-space-
block operation into a completely
erased tape, or forward-space-file
oferation on a tape that does not
contain a tape mark between the
starting point of the operation and
the p hy sical end of the tape) •
•
Having identified the cause of the
halt, discontinue the job by pres-
sing the start key on the CPU con-
sole to initiate the end-of-job
routine.
1481 Perform the following steps to
L--J identify the cause of the halt.
• Display location 9C, which contains
the address of the tape drive
concerned.
• Display location DO (sense byte ~ .
120 System/360 Model 20 TPS Operating Procedures

IBM System/360 20 Specifications

General

Brand	IBM
Model	System/360 20
Category	Storage
Language	English